- Acrobat User Guide
- Introduction to Acrobat
- Workspace
- Workspace basics
- Opening and viewing PDFs
- Working with online storage accounts
- Acrobat and macOS
- Acrobat notifications
- Grids, guides, and measurements in PDFs
- Asian, Cyrillic, and right-to-left text in PDFs
- Workspace basics
- Creating PDFs
- Editing PDFs
- Edit text in PDFs
- Edit images or objects in a PDF
- Rotate, move, delete, and renumber PDF pages
- Edit scanned PDFs
- Enhance document photos captured using a mobile camera
- Optimizing PDFs
- PDF properties and metadata
- Links and attachments in PDFs
- PDF layers
- Page thumbnails and bookmarks in PDFs
- PDFs converted to web pages
- Setting up PDFs for a presentation
- PDF articles
- Geospatial PDFs
- Applying actions and scripts to PDFs
- Change the default font for adding text
- Delete pages from a PDF
- Scan and OCR
- Forms
- PDF forms basics
- Create a form from scratch in Acrobat
- Create and distribute PDF forms
- Fill in PDF forms
- PDF form field properties
- Fill and sign PDF forms
- Setting action buttons in PDF forms
- Publishing interactive PDF web forms
- PDF form field basics
- PDF barcode form fields
- Collect and manage PDF form data
- About forms tracker
- PDF forms help
- Send PDF forms to recipients using email or an internal server
- Combining files
- Combine or merge files into single PDF
- Rotate, move, delete, and renumber PDF pages
- Add headers, footers, and Bates numbering to PDFs
- Crop PDF pages
- Add watermarks to PDFs
- Add backgrounds to PDFs
- Working with component files in a PDF Portfolio
- Publish and share PDF Portfolios
- Overview of PDF Portfolios
- Create and customize PDF Portfolios
- Sharing, reviews, and commenting
- Share and track PDFs online
- Mark up text with edits
- Preparing for a PDF review
- Starting a PDF review
- Hosting shared reviews on SharePoint or Office 365 sites
- Participating in a PDF review
- Add comments to PDFs
- Adding a stamp to a PDF
- Approval workflows
- Managing comments | view, reply, print
- Importing and exporting comments
- Tracking and managing PDF reviews
- Saving and exporting PDFs
- Security
- Enhanced security setting for PDFs
- Securing PDFs with passwords
- Manage Digital IDs
- Securing PDFs with certificates
- Opening secured PDFs
- Removing sensitive content from PDFs
- Setting up security policies for PDFs
- Choosing a security method for PDFs
- Security warnings when a PDF opens
- Securing PDFs with Adobe Experience Manager
- Protected View feature for PDFs
- Overview of security in Acrobat and PDFs
- JavaScripts in PDFs as a security risk
- Attachments as security risks
- Allow or block links in PDFs
- Electronic signatures
- Sign PDF documents
- Capture your signature on mobile and use it everywhere
- Send documents for e-signatures
- Create a web form
- Request e-signatures in bulk
- Collect online payments
- Brand your account
- About certificate signatures
- Certificate-based signatures
- Validating digital signatures
- Adobe Approved Trust List
- Manage trusted identities
- Printing
- Accessibility, tags, and reflow
- Searching and indexing
- Multimedia and 3D models
- Add audio, video, and interactive objects to PDFs
- Adding 3D models to PDFs (Acrobat Pro)
- Displaying 3D models in PDFs
- Interacting with 3D models
- Measuring 3D objects in PDFs
- Setting 3D views in PDFs
- Enable 3D content in PDF
- Adding multimedia to PDFs
- Commenting on 3D designs in PDFs
- Playing video, audio, and multimedia formats in PDFs
- Add comments to videos
- Print production tools (Acrobat Pro)
- Preflight (Acrobat Pro)
- PDF/X-, PDF/A-, and PDF/E-compliant files
- Preflight profiles
- Advanced preflight inspections
- Preflight reports
- Viewing preflight results, objects, and resources
- Output intents in PDFs
- Correcting problem areas with the Preflight tool
- Automating document analysis with droplets or preflight actions
- Analyzing documents with the Preflight tool
- Additional checks in the Preflight tool
- Preflight libraries
- Preflight variables
- Color management
Current members
Check out our current AATL members.
What is it?
The Adobe Approved Trust List is a program that allows millions of users around the world to create digital signatures that are trusted whenever the signed document is opened in Adobe® Acrobat® or Reader® software. Essentially, both Acrobat and Reader have been programmed to reach out to a web page to periodically download a list of trusted "root" digital certificates. Any digital signature created with a credential that can trace a relationship ("chain") back to the high-assurance, trustworthy certificates on this list is trusted by Acrobat and Reader.
How does it work?
Certificate authorities (CAs) — entities that provide digital signing credentials to other organizations and users — as well as governments and businesses that provide certificates to their citizens and employees can apply to Adobe to join the AATL program by submitting application materials and their root certificates (or another qualifying certificate). After verifying that the applicant's services and credentials meet the assurance levels imposed by the AATL technical requirements, Adobe adds the certificate(s) to the Trust List itself, digitally signs the Trust List with an Adobe corporate digital ID that is linked to the Adobe Root certificate embedded in Adobe products, and then posts the list to a website hosted by Adobe.
Afterwards, when any user receives a digitally signed document from a signer whose digital certificate can trace its lineage (chain) back to a certificate on the AATL, that signature will automatically be trusted.
Why is this feature important?
When you receive a digitally signed document, both Reader and Acrobat ask three key questions to validate the signature:
- Is the digital certificate that signed the document still valid? Has it expired or been revoked?
- Has the document been changed since it was signed? Has the integrity of the document been affected? If there are changes, are they allowed changes or not?
- Finally, does this certificate chain up to a certificate listed in the Trusted Identity list? If so, the signature will be trusted automatically.
The answers to the first two questions are handled by Acrobat and Reader based on an analysis of the information contained within the certificate and the signed document itself. However, it's the answer to the third question that has always posed a challenge to the electronic signatures marketplace. How do you know if you can trust a digital signature? What aspects of the signer's digital certificate/credential should be noted? How important is verifying the signer's identity, and how critical is the storage of the signing key itself?
Adobe understands that the relying party must be free to make its own trust decisions based on its unique circumstances. However, Adobe has also been looking at ways to help relying parties make this determination and in so doing make the process of using digital signatures that much easier. The Adobe Approved Trust List is simply the latest in these efforts.
How does this program compare to the CDS program?
Back in 2005, Adobe unveiled the Certified Document Services (CDS) program, which automatically trusts new digital IDs that are chained to (part of the family of) the Adobe Root certificate embedded in Adobe products. CDS, the predecessor to the AATL, has five certificate authorities offering certificates. While the high-level benefits of the Adobe Approved Trust List program are similar, existing certificate communities, such as government eID programs, can join the Trust List, as the chain to the Adobe Root certificate is not required.
Why would my organization want to join?
If you represent an organization or government that already has a significant investment in digital certificates (that is, hundreds of thousands of users), and these certificates are being used to sign PDF documents, then you already know the importance of trust and how confusion over a digital signature can lead to support calls, questions, and general uneasiness about using a digital signature. The AATL program provides an easy way for all your certificate holders, assuming they meet the technical requirements, to sign documents confidently, knowing that recipients will not only get the cost savings and a resulting "green" benefit from staying with an electronic document, but also the integrity-checking and trusted green checkmark/blue ribbon experience when they open the document.
How do I get an AATL-enabled signing credential?
Adobe does not sell these credentials but manages the program by which these credentials are trusted. To purchase AATL-enabled certificates, contact one of the members. Also check the list to see if your organization may already be a part of the AATL.
How do I configure the feature for enterprise deployments?
For enterprise configuration details, refer to the Preference Reference. Options include:
- Disabling the feature.
- Enabling silent import of certificates so that end users don't see the import dialog.
AATL technical requirements
This is the official repository of the AATL Technical Requirements. The most recent specification published here applies currently.
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Join now!
If your organization is interested in joining the AATL program, first please review the Technical Requirements. If you meet the requirements, then contact the AATL team at Adobe to receive more information by clicking the link below: